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This quest item begins Chapter I of the Black Prince story and will earn you a legendary gem to place in a Sha-Touched weapon.

The full quest chain for Chapter I is as follows:

It begins with the  Mysterious Note, which is given from several NPCs in Pandaria.  It will direct to you visit Wrathion in the Veiled Stair for the quest Stranger in a Strange Land.  Once there, he will ask you to share a drink with him for the quest A Legend in the Making which gives you some lore background and his story.

Wrathion will then give you two quests to complete:

• The Strength of One's Foes
• Trial of the Black Prince

 Sigil of Power and  Sigil of Wisdom drop in  Mogu'shan Vaults,  Heart of Fear, and  Terrace of Endless Spring on any difficulty level.

The reputation can be farmed from various level 90 mobs out in the world.

After this, you will get the quest Fear Itself which requires you to kill the Sha of Fear in the  Terrace of Endless Spring to get the  Chimera of Fear.  This item can be looted in LFR, Normal or Heroic modes.

Finally, he will ask you to meet just outside the inn to complete Breath of the Black Prince and pick up your new gem and the achievement  Chapter I: Trial of the Black Prince and begin the second chapter.

This version is specifically for Rogues. It references the previous quest chain for the Rogue legendaries Fangs of the Father .

My friend -

   A great deal has happened since we last crossed paths in the Eastern Kingdoms. I hope you haven't forgotten about me.

   All is quiet on Pandaria - for the moment - but world events are developing quickly. Help me to shape the course of the upcoming conflict and you will be generously rewarded.

   Please seek me out at the Tavern in the Mists, hidden away in the Veiled Stair.

-The Black Prince